Interesting. I knew you could defeat the protection with multiple copies but the number of copies needed to do it could be increased massively. Let's say they want to catch a serial leaker. They could do massive "watermark cohorts". Like several thousand units sold big. It would surely take several leaks to narrow down the suspect but combined with time information it would pose a significant risk to whoever wants to leak books.

Also,

>In Poland, there's no single E Ink reader company

lol imagining a tech sector without a monopoly or an obviously harmful duopoly is wild.